Gas phase electronic spectra of pure carbon cations generated by laser vaporization of graphite in a supersonic jet and cooled to below 10 K and tagged with helium atoms in a cryogenic trap are presented. The measured C 2 n + –He with n from 6 to 14, are believed to be monocyclic ring structures and possess an origin band wavelength that shifts linearly with the number of carbon atoms, as recently demonstrated through N 2 tagging by Buntine et al. ( 34879679 J. Chem. Phys. 2021 155 214302 ). The set of data presented here further constrains the spectral characteristics inferred for the bare C 2 n + ions to facilitate astronomical searches for them in diffuse clouds by absorption spectroscopy.

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Endoluminal brachytherapy during the course of esophageal cancer treatment can be safely applied and results in good functional outcomes regarding dysphagia with low rates of severe toxicities.